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Effect of Dibutyl Ether - Methanol Blend Ratios on Deflagration-Based and Autoignition-Based Knock in Spark-Ignition Engines

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Effect of Dibutyl Ether - Methanol Blend Ratios on Deflagration-Based and Autoignition-Based Knock in Spark-Ignition Engines

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dc.contributor.author Singh, Eshan es_ES
dc.contributor.author Abboud, Rami es_ES
dc.contributor.author Strickland, Tyler es_ES
dc.contributor.author Kim, Namho es_ES
dc.contributor.author López Pintor, Darío es_ES
dc.contributor.author Sjöberg, Magnus es_ES
dc.date.accessioned 2024-10-03T18:26:46Z
dc.date.available 2024-10-03T18:26:46Z
dc.date.issued 2024-11-15 es_ES
dc.identifier.issn 0016-2361 es_ES
dc.identifier.uri http://hdl.handle.net/10251/209285
dc.description.abstract [EN] Methanol is an attractive fuel that can be produced using renewable sources. However, its low reactivity may present challenges to combustion modes (like Spark-Assisted Compression Ignition) that rely on autoignition. To tweak its reactivity, a highly reactive bio-derived molecule, dibutyl ether (DBE), was blended in varying volume percentages (from 0 to 40% v/v). Experiments were conducted for a) lean operation with air-fuel ratio lambda = 2, b) stoichiometric steady-state operation, and c) stoichiometric transient-state operation. For lean operation, adding increasing fractions of DBE increased the reactivity, as evidenced by a retarded knock-limited combustion phasing. For stoichiometric steady operation, the addition of DBE had very little impact on the knock limits at lower blends up to 20% v/v. A unique knock phenomenon, hereby termed as deflagration-based knock, was observed for these blends, wherein pressure oscillations were observed as the flame-front progressed, without autoignition. The knock mode shifted to conventional end-gas autoignitionbased knock for 30% and 40% DBE blends. For stoichiometric transient conditions, marked by cooler operation, all DBE blends showed only deflagration-based knock. Spectral analysis of the deflagration-based knock suggests higher contribution from the 10-15 kHz range, corresponding to second-mode harmonics. Computational studies conducted to match the stoichiometric operating condition showed similar pressure oscillations. Analysis of the simulated results imply that deflagrationbased knock occurs when the flame reacts to the pressure disturbances such that a feedback loop increases the pressure oscillations in each flame-front passage. The findings of this study highlight the physics behind deflagration-based knock, as observed in DBE-methanol blends, and are critical to other renewable fuels such as ethanol and hydrogen. Novelty and Significance: The manuscript uses fully renewable blends of dibutyl ether and methanol for sparkassisted compression ignition with lean fuel-air mixture, and for conventional stoichiometric spark-ignition combustion. For stoichiometric operation, the authors observe a unique phenomenon where pressure oscillations start right after the spark timing, and increases as flame-front moves forward, hereby termed as deflagration-based-knock. This novel phenomenon is explained on the basis of pressure-dependent reactivity, which provides a feedback mechanism to the pressure oscillations. According to the authors, the observations are significant to fast-burning fuels (or more generally, fast combustion), and observations have been recorded elsewhere for ethanol (by authors) and hydrogen (elsewhere). To the best of our knowledge, this is the first investigation of deflagration-based-knock in small-bore engines, or in conventional spark-ignition combustion. Authors suggest that depending on the operating conditions, deflagration-based-knock may form a bottleneck to engines operating on such renewable fuels. Moreover, conventional knock mitigation mechanism, like retarding spark timing, may not be effective against the novel deflagration-based-knock. es_ES
dc.description.sponsorship Sandia National Laboratories is a multimission laboratory managed and operated by National Technology & Engineering Solutions of San-dia, LLC (NTESS) , a wholly owned subsidiary of Honeywell International Inc., for the U.S. Department of Energy's National Nuclear Security Administration (DOE/NNSA) under contract DE-NA0003525. This written work is authored by an employee of NTESS. The employee, not NTESS, owns the right, title and interest in and to the written work and is responsible for its contents. Any subjective views or opinions that might be expressed in the written work do not necessarily represent the views of the U.S. Government. The publisher acknowledges that the U.S. Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this written work or allow others to do so, for U.S. Government purposes. The DOE will provide public access to results of federally sponsored research in accordance with the DOE Public Access Plan. es_ES
dc.language Inglés es_ES
dc.publisher Elsevier es_ES
dc.relation.ispartof Fuel es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Knock es_ES
dc.subject Renewable fuels es_ES
dc.subject Direct injection spark ignition engines es_ES
dc.subject Deflagration es_ES
dc.subject Autoignition es_ES
dc.subject Methanol es_ES
dc.subject Ignition improver es_ES
dc.title Effect of Dibutyl Ether - Methanol Blend Ratios on Deflagration-Based and Autoignition-Based Knock in Spark-Ignition Engines es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.1016/j.fuel.2024.132670 es_ES
dc.relation.projectID info:eu-repo/grantAgreement/DOE//DE-NA0003525/ es_ES
dc.rights.accessRights Cerrado es_ES
dc.description.bibliographicCitation Singh, E.; Abboud, R.; Strickland, T.; Kim, N.; López Pintor, D.; Sjöberg, M. (2024). Effect of Dibutyl Ether - Methanol Blend Ratios on Deflagration-Based and Autoignition-Based Knock in Spark-Ignition Engines. Fuel. 376. https://doi.org/10.1016/j.fuel.2024.132670 es_ES
dc.description.accrualMethod S es_ES
dc.relation.publisherversion https://doi.org/10.1016/j.fuel.2024.132670 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 376 es_ES
dc.relation.pasarela S\525489 es_ES
dc.contributor.funder U.S. Department of Energy es_ES


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